<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    a:hover{
      color: aqua;
      text-decoration: none;
    }
  </style>
</head>
<body>
  <form action="">

    用户名：<input type="text" name="username"><br>
    密码：<input type="password" name="password"><br>
    性别：
    <label for="nan">男</label>
    <input type="radio" name="sex" id="nan">
    <label for="nv">女</label>
    <input type="radio" name="sex" id="nv"><br>
    <input type="checkbox" checked="checked">12
    <input type="submit" value="免费零鸡蛋"><br>
    <textarea name="" id="" rows="5" cols="100">sdfjkl;;lkjhgfxz</textarea>
    <select name="" id="">
      <option value="">nan</option>
    </select><br>
    <meter value="30" max="100"></meter>
  </form>
    <a href="baidu.com">baiud</a>
</body>
</html>